What is the allowable height for a handrail?

Handrail height for stairs according to the Australian standards is the height of a handrail above the floor or the nosing of a stair tread, which shall be no less than 865mm. 

On a landing where fall from height is significant the height of the guardrail must be at least 1000 mm. 

In a general corridor, our recommended handrail height is 900mm.